Simon "the infertile" Belmont, lol. I love Simon, but if he was sterile, it's probably more likely to be the fault of steroids than it is Dracula.
Here's a reason why there are so many versions of the first Castlevania. Each version is Simon telling the story again.
Simon: Did I ever tell you kids about the time I killed Dracula?
Juste: Yes Grandpa, you've told us like a hundred times.
Simon: It all started when Dracula swooped out of the sky and took your Grandma as we were leaving the church.
Juste: Why did you get married in the middle of the night?
Simon: So I took out my trusty whip and yelled "Dracula, I'm a comin'!"
Juste: Why did you bring a whip to your wedding?
Simon: ... and at the end of the first corridor, I turn the corner, and there's this huge fucking bat. So I just pulled out my trusty battle axe and started throwing it at him.
Juste: Why would you throw it at him? Wouldn't you just have to go pick it up after it fell back down? This story never makes any sense.
Simon: Don't back talk your elders young man! And get your hair cut.
Juste: Grandpa, this is the style.
Simon: Back in my day we wore manly mullets. For cryin' out loud son, you look like a girl! And what's with that giant red coat? Where's your ultra tight body armor that leaves nothing to the imagination? If you want people to think you're a real man, you've gotta show them your man parts, son.
Juste: sigh
Simon: Did I ever tell you about my friend Arthur. Now there's a real man. See, he and his girlfriend were having a picnic in the graveyard in the middle of the night, when all of a sudden, Satan shows up and steals her away.
Juste: What?
Simon: So he fights his way all the way to Satan, while only wearing his underpants.
Juste: Why would anyone do that?
Simon: But that Satan is a tricky one, and he transports Arthur all the way back to the graveyard. So Arthur has to fight his way all the way back to Satan again.
Juste: Why didn't Satan just teleport him into the ocean or space or something?
Simon: You young'ns got it too easy. You couldn't even kill Dracula's ghost, lookin' like you do.